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  <div class="section" id="apsis-the-acs-data-reduction-pipeline">
<h1>Apsis - the ACS data reduction pipeline<a class="headerlink" href="#apsis-the-acs-data-reduction-pipeline" title="Permalink to this headline">¶</a></h1>
<p><em>Apsis</em> is the image processing and analysis pipeline for data from the
Hubble Space Telescope&#8217;s (HST) Advanced Camera for Surveys (ACS).  It
can work with images from any of ACS&#8217;s three cameras: the Wide Field
Channel (WFC), the High Resolution Channel (HRC), and the Solar Blind
Channel (SBC).</p>
<p><em>Apsis</em> processing includes aligning images, co-adding the images
observed with the same filter, making a detection image from the
individual filter images, cataloging the sources found in the detection
image, measuring photometry for these sources in all filters and
correcting the results for aperture effects and foreground extinction.
<em>Apsis</em> is written mostly in python with some code in C.  <em>Apsis</em> was
developed for the ACS GTO team and should not be confused with <a class="reference external" href="http://stsdas.stsci.edu/cgi-bin/gethelp.cgi?calacs">CALACS</a> the <a class="reference external" href="http://stsdas.stsci.edu/cgi-bin/">STScI</a> pipeline to
preform basic calibrations of ACS data.</p>
<p><strong>Development Team:</strong> Ken Anderson, John Blakeslee, Rychard Bouwens, Dan
Magee, Gerhardt Meurer, Txitxo Benitez, Nicholas Cross, Felipe
Menanteau, Andre Martel.</p>
<p>Contents:</p>
<ul>
<li class="toctree-l1"><a class="reference external" href="intro.html">Introduction</a><ul>
<li class="toctree-l2"><a class="reference external" href="intro.html#what-it-does">What it does</a></li>
<li class="toctree-l2"><a class="reference external" href="intro.html#caveats">Caveats</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference external" href="install.html">Download and Installation</a><ul>
<li class="toctree-l2"><a class="reference external" href="install.html#download">Download</a></li>
<li class="toctree-l2"><a class="reference external" href="install.html#dependent-software">Dependent Software</a></li>
<li class="toctree-l2"><a class="reference external" href="install.html#installation-on-a-mac-osx-system">Installation on a Mac OSX system</a></li>
<li class="toctree-l2"><a class="reference external" href="install.html#installation-on-a-linux-system">Installation on a linux system</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference external" href="prelims.html">Preliminary steps</a><ul>
<li class="toctree-l2"><a class="reference external" href="prelims.html#setting-up-the-environment-variables">Setting up the environment variables</a></li>
<li class="toctree-l2"><a class="reference external" href="prelims.html#initial-processing">Initial Processing</a></li>
<li class="toctree-l2"><a class="reference external" href="prelims.html#getting-acs-images">Getting ACS images</a></li>
<li class="toctree-l2"><a class="reference external" href="prelims.html#getting-reference-files">Getting Reference Files</a></li>
<li class="toctree-l2"><a class="reference external" href="prelims.html#organizing-the-input-files">Organizing the input files</a></li>
<li class="toctree-l2"><a class="reference external" href="prelims.html#making-association-tables">Making Association tables</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference external" href="running.html">Running Apsis</a><ul>
<li class="toctree-l2"><a class="reference external" href="running.html#quickstart">Quickstart</a></li>
<li class="toctree-l2"><a class="reference external" href="running.html#command-line-options">Command line options</a></li>
<li class="toctree-l2"><a class="reference external" href="running.html#output-directory-structure-and-files">Output directory structure and files</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference external" href="modules.html">Modules</a><ul>
<li class="toctree-l2"><a class="reference external" href="modules.html#apsis-modules">Apsis modules</a></li>
<li class="toctree-l2"><a class="reference external" href="modules.html#xydrizzle-modules">xydrizzle modules</a></li>
<li class="toctree-l2"><a class="reference external" href="modules.html#utility-modules">Utility modules</a></li>
<li class="toctree-l2"><a class="reference external" href="modules.html#c-code">C code</a></li>
<li class="toctree-l2"><a class="reference external" href="modules.html#stand-alone-programs">Stand-alone programs</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference external" href="citation.html">Citation</a></li>
<li class="toctree-l1"><a class="reference external" href="license.html">License</a></li>
<li class="toctree-l1"><a class="reference external" href="appendix.html">Appendix</a><ul>
<li class="toctree-l2"><a class="reference external" href="appendix.html#superalign"><tt class="docutils literal"><span class="pre">superalign</span></tt></a></li>
</ul>
</li>
</ul>
</div>
<div class="section" id="indices-and-tables">
<h1>Indices and tables<a class="headerlink" href="#indices-and-tables" title="Permalink to this headline">¶</a></h1>
<ul class="simple">
<li><a class="reference external" href="genindex.html"><em>Index</em></a></li>
<li><a class="reference external" href="modindex.html"><em>Module Index</em></a></li>
<li><a class="reference external" href="search.html"><em>Search Page</em></a></li>
</ul>
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